/*
 * Copyright (C) 2010 Geometer Plus <contact@geometerplus.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

package org.geometerplus.fbreader.tree;

import org.geometerplus.zlibrary.core.image.ZLImage;
import org.geometerplus.zlibrary.core.tree.ZLTree;

import java.util.Collections;
import java.util.List;

public abstract class FBTree extends ZLTree<FBTree> implements Comparable<FBTree> {

    private ZLImage myCover;
    private boolean myCoverRequested;

    protected FBTree(int level) {
        super(level);
    }

    protected FBTree() {
        super();
    }

    protected FBTree(FBTree parent) {
        super(parent);
    }

    protected FBTree(FBTree parent, int position) {
        super(parent, position);
    }

    public abstract String getName();

    protected String getSortKey() {
        return getName();
    }

    public int compareTo(FBTree ct) {
        final String key0 = getSortKey();
        final String key1 = ct.getSortKey();
        if (key0 == null) {
            return (key1 == null) ? 0 : -1;
        }
        if (key1 == null) {
            return 1;
        }
        return key0.toLowerCase().compareTo(key1.toLowerCase());
    }

    public final void sortAllChildren() {
        List<FBTree> children = subTrees();
        if (!children.isEmpty()) {
            Collections.sort(children);
            for (FBTree tree : children) {
                tree.sortAllChildren();
            }
        }
    }

    private String mySecondString;

    public final void invalidateChildren() {
        mySecondString = null;
    }

    public final String getSecondString() {
        if (mySecondString == null) {
            mySecondString = getSummary();
            if (mySecondString == null) {
                mySecondString = "";
            }
        }
        return mySecondString;
    }

    protected String getSummary() {
        StringBuilder builder = new StringBuilder();
        int count = 0;
        for (FBTree subtree : subTrees()) {
            if (count++ > 0) {
                builder.append(",  ");
            }
            builder.append(subtree.getName());
            if (count == 5) {
                break;
            }
        }
        return builder.toString();
    }

    protected ZLImage createCover() {
        return null;
    }

    public final ZLImage getCover() {
        if (!myCoverRequested) {
            myCover = createCover();
            if (myCover == null && Parent != null) {
                myCover = Parent.getCover();
            }
            myCoverRequested = true;
        }
        return myCover;
    }
}
